KR20210100484A - Aluminium die-casting alloy with high strength by addition of Si and Zn and manufacturing or the same - Google Patents

Abstract

The present invention relates to an aluminum alloy for high strength diecasting which adds silicon (Si) and zinc (Zn) to a casting alloy to maintain liquidity of the casting alloy and improve strength, toughness, corrosion resistance, and releasability, and a manufacturing method thereof. The present invention, aluminum (Al) as a main component, comprises: 8.0-11.5 wt% of the silicon (Si); 0.1-9.0 wt% of the zinc (Zn); 0.1-3.0 wt% of magnesium (Mg); 0.0001-0.1999 wt% of copper (Cu); 0.0001-0.8 wt% of manganese (Mn); 1.3 wt% or less of iron (Fe); 0.3 wt% or less of titanium (Ti); and 0.0001-0.045 wt% of strontium (Sr).

Description

Aluminum die-casting alloy with high strength by addition of Si and Zn and manufacturing or the same}

The present invention relates to an aluminum alloy for high-strength die casting, and more specifically, by adding silicon (Si) and zinc (Zn) to the alloy for casting, while maintaining the fluidity of the alloy for casting, strength, toughness, corrosion resistance and releasability are simultaneously improved It relates to an aluminum alloy for high-strength die casting and a method for manufacturing the same.

The alloy for aluminum casting is indicated by the code of AC (Aluminum Casting), and the alloy for die casting is indicated by the code of ALDC (Aluminum Die Casting) and is widely used.

In AC series, when aging heat treatment is performed after casting, the tensile strength is high in the range of 300 MPa to 400 MPa, but the elongation is mostly in the range of about 1 to 2%, and the toughness is extremely insufficient. The ADLC series has a tensile strength in the range of 200 MPa to 300 MPa, and the elongation is mostly about 3% or less, so it also lacks toughness.

If the toughness of the alloy is small, the alloy is easily fractured when an impact is applied to the structure. In general, since toughness and elongation are in a proportional relationship, elongation can be used as a simple indicator of toughness.

In addition, when a crack or stress corrosion crack occurs due to local corrosion on the surface of the aluminum alloy, stress is concentrated in the crack or crack and the alloy can be easily destroyed. Therefore, corrosion resistance of the aluminum alloy is also important. On the other hand, since releasability with a mold is also important for aluminum casting in a casting or die casting process, releasability is also one of important characteristics in an aluminum alloy for casting.

Therefore, there is a continuous need for an aluminum alloy for casting that has a tensile strength of 300 MPa or more, and has excellent toughness, elongation, corrosion resistance, castability and releasability.

Republic of Korea Patent Publication No. 10-1545970 (Registered on August 13, 2015) Republic of Korea Patent Publication No. 10-2018-0057892 (published on May 31, 2018) Republic of Korea Patent Publication No. 10-1965418 (Registered on March 28, 2019) Republic of Korea Patent Publication No. 10-1691001 (Registered on December 23, 2016) Republic of Korea Patent Publication No. 10-1380935 (Registered on March 27, 2014)

Commercial alloys for casting include AC1 type to AC9 type according to KS standards, and commercial alloys for die casting include ALDC 1 type to ALCD 12 types according to KS specifications. In addition to alloys of these specifications, various types of alloys are continuously being developed, but especially for die casting, they have tensile strength of 300 MPa or more, yield strength (yield strength) of 200 MPa or more, and elongation of 3% or more, and have toughness, corrosion resistance, castability and releasability. There is a continuing need for this superior die-casting aluminum alloy.

Republic of Korea Patent Registration Nos. 10-1133103, 10-1274089, 10-1269516, and 10-1545970 are documents for increasing the strength of die-casting alloys by adding zinc, magnesium, and copper to aluminum, but silicon Since it is not added, there is a limit to lowering the melting point of the alloy, so die casting is not easy.

Korean Patent Laid-Open Patent No. 10-2018-0057892 and Patent Registration No. 10-1052517 do not include the effect of zinc in the technical idea, and Korean Patent Registration No. 10-1965418 Manganese is not added, and a document on a heat treatment method of an alloy corresponds to

In addition, Korean Patent Laid-Open Patent Publication No. 10-2014-0091858 and Patent Registration No. 10-1691001 express technical ideas for copper 2.0wt% or more and 0.50wt% composition, respectively, and thus are significantly different from the present invention.

In the case of Korean Patent Registration No. 10-1380935, the composition of the alloy is similar to that of the present invention, but in this patent, zinc is added up to 0.50 wt%, so that only a small amount of the alloy element is effective. Also, the basic idea of this patent relates to a heat treatment method of an alloy, emphasizing solution heat treatment at 470°C for 6 hours and annealing treatment at 177°C for 5 hours. Therefore, the biggest difference from the present invention is whether or not zinc is added. In the present invention, in addition to the interaction between zinc and other elements, it is characterized in that the effect of increasing the strength of zinc itself is derived in earnest due to the addition of 1 wt% or more in large quantities. In addition, in the present invention, a significant increase in strength is shown only by die casting, so the importance of solution treatment is halved, and the technical idea is different from that of Patent Registration No. 10-1380935.

In general, the die-casting alloy is designed to facilitate die-casting by lowering the melting point of the alloy by including 7 wt% or more of silicon or 2.5 wt% or more of magnesium. At this time, the mechanical properties of the alloy have a tensile strength in the range of 200 MPa to 300 MPa, and the elongation is mostly about 3% or less.

The 7000 series, which is an aluminum alloy for processing, has an Al-Zn-Mg series composition, and has a strength of 300 MPa or more and an elongation of 10% or more. The composition of this alloy series has a range of 1.0 to 6.5 wt% of zinc and 0.5 to 3.0 wt% of magnesium. In addition, there are alloys further containing copper, and for example, in the case of alloy 7075, copper is further included in the range of 1 to 2 wt%.

However, although the mechanical properties of the 7000 series satisfy the mechanical properties targeted by the present invention, the melting point of the alloy is high, so that it cannot be used for die casting. The reason the melting point is high is because, unlike the alloy for die casting, the content of silicon contains 1 wt% or less.

An object of the present invention for the above problems is to solve all the problems described above in relation to the aluminum alloy for casting and die casting. The present invention combines the advantages of the ALDC series and AC series, which are commercial alloys for casting, and the advantages of the 7000 series, which is a commercial alloy for machining, and combines a more improved aluminum alloy composition to provide high strength, ductility, corrosion resistance, castability and mold release properties. An object of the present invention is to provide an aluminum alloy composition for use and a method for manufacturing the same.

The aluminum alloy for high-strength die-casting of the present invention for achieving the above object, 8.0 to 11.5 wt% of silicon (Si); 0.1 to 9.0 wt% of zinc (Zn); 0.10 to 3.0 wt % of magnesium (Mg); 0.0001 to 0.1999 wt% of copper (Cu); 0.0001 to 0.80 wt% of manganese (Mn); 1.3 wt% or less of iron (Fe); 0.30 wt% or less of titanium (Ti); 0.0001 to 0.045 wt% of strontium (Sr); and the remainder aluminum (Al) and unavoidable impurities.

Preferably, the aluminum alloy of the present invention described above may have a more narrow composition ratio.

That is, in the aluminum alloy of the present invention, the content of silicon (Si) is 8.0 to 10.0 wt% or 9.0 to 11.0 wt% or 9.50 to 11.50 wt%,

The content of zinc (Zn) is 1.0 to 9.0 wt% or 4.0 to 9.0 wt% or 5.0 to 9.0 wt%, and the content of magnesium (Mg) is 0.10 to 0.60 wt% or 0.6001 to 3.0 wt% desirable.

In addition, the copper (Cu) content is 0.10 to 0.60 wt% or 0.6001 to 1.9999 wt%, and the manganese (Mn) content is 0.30 to 0.60 wt% or 0.50 to 0.80 wt%,

The content of iron (Fe) is 0.55 wt% or less or 0.15 wt% or less,

The content of the titanium (Ti) is 0.20 wt% or less or 0.15 wt% or less,

The strontium (Sr) is 0.003 to 0.030 wt% or 0.005 to 0.015 wt%.

In addition, the aluminum alloy further comprises a rare earth metal having an atomic number of 57 (La) to 71 (Lu) or a combination of these rare earth metals including lanthanum (La) and cerium (Ce). It is characterized in that the content of one metal is further included in the range of 0.0001 to 3.0 wt%.

In addition, the aluminum alloy is characterized in that it further comprises 0.0001 to 0.30 wt% or 0.05 to 0.30 wt% of zirconium (Zr).

In addition, the aluminum alloy further includes a phosphorus (P) component in an amount of 0.0001 to 0.0250 wt% or 0.0001 to 0.0030 wt%, and any one of gallium phosphide (InP), indium phosphide (GaP) or a combination thereof further characterized by including.

In addition, the aluminum alloy is characterized in that it further comprises 0.0001 to 0.50 wt% or 0.01 to 0.50 wt% of molybdenum (Mo).

In addition, the aluminum alloy is at least one selected from Cr, V, Ni, In, Pb, Bi, Ca, Na, P, B, Ag, Pd, Sb, Sc, Nb, Co, Mo, Be, Hf, or Y It is characterized in that it further comprises.

In addition, the aluminum alloy further comprises any one of ZrO ₂ , SiO ₂ , Al ₂ O ₃ , Y ₂ O _{3 ,} CeO ₂ , La ₂ O ₃ or a combination thereof in the range of 0.0001 to 0.50 wt%, Alternatively, these oxides are characterized in that they exist uniformly dispersed in the state of nano-sized particles in the alloy. Here, _{the input of any one of ZrO 2} , SiO ₂ , Al ₂ O ₃ , Y ₂ O ₃ , CeO ₂ , La ₂ O ₃ or a combination thereof produces a master alloy of aluminum and its or its oxides, and the It is characterized in that the master alloy is put into the molten metal.

In addition, the present invention has aluminum (Al) as a main component, 8.0 to 11.5 wt% of silicon (Si); 0.1 to 9.0 wt% of zinc (Zn); 0.10 to 3.0 wt % of magnesium (Mg); 0.0001 to 0.1999 wt% of copper (Cu); 0.0001 to 0.80 wt % of manganese (Mn); 1.3 wt% or less of iron (Fe); 0.30 wt% or less of titanium (Ti); It provides a method for manufacturing an aluminum alloy for high-strength die casting, characterized in that heat treatment is performed on an aluminum alloy containing 0.0001 to 0.045 wt% of strontium (Sr) at 100 to 200° C. for 0.5 to 24 hours.

The present invention combines the advantages of the ALDC series and AC series, which are commercial alloys for casting, and the advantages of the 7000 series, which is a commercial alloy for machining, and combines a more improved aluminum alloy composition to provide high strength, ductility, corrosion resistance, castability and mold release properties. It relates to the aluminum alloy composition for use. Due to this, it is possible to greatly expand the applications of aluminum alloys for casting or die casting.

1 is a characteristic graph in which mechanical properties are measured among data measuring tensile strength, yield strength, elongation, hardness, fluidity, and releasability of an alloy according to the present invention.
2A and 2B are molds manufactured to evaluate the fluidity of the fluid molten metal during die casting of the alloy of the present invention, and FIGS. 2A and 2B show a funnel and a cover for pouring the molten metal into the spiral mold and the spiral mold, respectively. It is a drawing.

Hereinafter, the composition of the aluminum alloy by this invention and its manufacturing process are demonstrated. Since the embodiments described herein are only the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention, there may be various equivalents and modifications that can be substituted for them at the time of the present application. should understand On the other hand, the content indication in the present invention is a ratio with respect to the total weight of the aluminum alloy. All content indications in the description and claims of the present invention are also the same.

In the case of development of metal alloy composition, it is a well-known fact that even if the composition of alloy elements changes by about 0.005%, significant changes occur in physical properties due to the specificity of the alloy technology field.

Since the types of alloying elements are as many as the types of metals on the periodic table, numerous combinations can occur in the development of alloy compositions. Therefore, even minute changes in the type and composition of alloying elements can significantly improve the properties of the new alloy, so minute changes in the composition and composition of the alloy are also very important in the field of alloy composition development.

< Effect of addition of alloying elements >

The main alloying elements in aluminum alloys are silicon (Si), manganese (Mn), magnesium (Mg), copper (Cu), zinc (Zn), iron (Fe), titanium (Ti), strontium (Sr), and zirconium (Zr). ), molybdenum (Mo) and rare earth elements such as cerium (Ce) and lanthanum (La) have the following effects on the properties of the alloy.

Silicon (Si)

Silicon (Si) is a major component that increases the fluidity of the alloy in the molten state during the die casting process. When an appropriate amount is added, the melting point decreases, thereby improving castability and increasing fluidity. However, when it is added excessively, the fluidity deteriorates. In addition, as the content of Si increases, it acts as an element to improve fatigue strength, hardness and wear resistance, but reduces ductility and impact resistance. When coexisting with magnesium (Mg), Mg ₂ Si may be formed to improve strength by aging treatment.

A preferred range in the present invention is 8.0 to 11.5 wt%, and a more preferred range is 8.0 to 10.0 wt% or 9.0 to 11.0 wt% or 9.5 to 11.5 wt%.

Magnesium (Mg)

Magnesium (Mg) improves mechanical strength by the solid solution effect, and aging strengthening characteristics may occur depending on the coexistence of silicon (Si) and zinc (Zn). Machinability is improved, corrosion resistance to seawater is improved, and solidification shrinkage is reduced. Weldability and surface finish properties are also improved. However, since the fluidity of the molten metal is weakened and the bond with oxygen is particularly strong, care must be taken to introduce oxides. When the content is more than an appropriate amount, fluidity deteriorates, and when more is added, die casting becomes difficult, and micro-bubbles are easily generated on the surface of the alloy.

A preferred range in the present invention is in the range of 0.1 to 3.0 wt%. A more preferred range is 0.10 to 0.60 wt% or 0.6001 to 3.0 wt%.

Manganese (Mn)

Manganese (Mn) increases the strength of the aluminum alloy, has the effect of removing the bad effect of iron (Fe) and the grain refinement effect, and forms a compound that does not impair corrosion resistance. Therefore, it is possible to improve the strength without lowering the corrosion resistance. In addition, it can cause hot spots in casting, and has the effect of increasing the releasability from the mold.

A preferred range in the present invention is 0.0001 to 0.80 wt%, and a more preferred range is 0.0001 to 0.30 wt% or 0.30 to 0.60 wt% or 0.50 to 0.80 wt%.

Copper (Cu)

Copper (Cu) is dissolved in a matrix to increase the strength of the aluminum alloy and cause an age hardening effect. When the content exceeds 0.60 wt%, extrudability and corrosion resistance are simultaneously reduced, and when the content exceeds an appropriate amount, fluidity is reduced.

A preferred range in the present invention is 0.0001 to 1.999 wt% (excluding 0.50 wt%), and a more preferred range is 0.0001 to 0.60 wt% or 0.6001 to 1.999 wt%.

Zinc (Zn)

Zinc (Zn) coexists with magnesium (Mg) to improve mechanical properties and can significantly improve castability. It also exhibits some effect on age hardening.

A preferred range in the present invention is 0.1 to 9.0 wt%, and a more preferred range is 1.0 to 9.0 wt% or 4.0 to 9.0 wt% or 5.0 to 9.0 wt%.

iron (Fe)

Iron (Fe) is an element that precipitates as an intermetallic compound in an aluminum alloy and improves wear resistance. When the content is less than 0.1wt%, there is almost no wear resistance effect, and when it exceeds 0.3wt%, the particles are coarsened and workability is deteriorated.

_{Also, an Al 3} Fe compound is formed even in a very small amount, and since it is combined with silicon (Si) to form an Al-Fe-Si intermetallic compound, it is a factor of deterioration of mechanical properties. Even a small amount deteriorates the surface gloss and weakens corrosion resistance and ductility.

Iron (Fe) prevents sintering in the mold during the die casting process, and the amount added at this time is sufficient if it is 0.5 wt% to 1.0 wt% or less, and if it exceeds 0.5 wt%, the ductility of the alloy tends to decrease.

A preferred range in the present invention is 1.30 wt% or less. A more preferred range is 0.55 wt% or less or 0.15 wt% or less.

Titanium (Ti)

Titanium (Ti) improves mechanical properties as a particle refining element and has a crack prevention effect. If it is less than 0.05 wt%, the effect is small, and if it is 0.2 wt% or more, a decrease in elongation may occur. When added excessively, there is a problem of causing brittleness, so it is preferable to be added within an appropriate range. When it exceeds 0.25 wt%, a coarse intermetallic compound is formed to reduce formability (processability).

A preferred range in the present invention is 0.30 wt% or less. A more preferred range is 0.20 wt% or less or 0.15 wt% or less.

Strontium (Sr)

Strontium (Sr), as a modifier, improves the flowability by changing the shape of the alloy structure, particularly the AlSi structure, from a needle to a fine spherical shape. However, care must be taken because there is a disadvantage in that mechanical strength is lowered when excessively added. In addition, it improves the releasability in the mold.

The effect appears from the addition of 30ppm, and if it is over 350ppm, it may cause the formation of bubbles during welding, so be careful. Above 450 ppm, the elongation decreases.

A preferred range in the present invention is 0.0001 to 0.045 wt%, and a more preferred range is 0.003 to 0.030 or 0.005 to 0.015 wt%.

Zirconium (Zr)

Zirconium (Zr) exhibits precipitation hardening and grain refinement effects. If it is less than 0.05wt%, the effect of grain refinement is weak, and if it is more than 0.2wt%, it affects the elongation reduction.

A preferred range in the present invention is 0.0001 to 0.30 wt% or 0.05 to 0.30 wt%.

Molybdenum (Mo)

Molybdenum (Mo) is characterized in that the elongation is increased without a decrease in other mechanical properties by dissolving in aluminum grains. However, care must be taken because the addition of Mo increases the melting point of the alloy.

A preferred range in the present invention is in the range of 0.0001 to 0.50 wt%. A more preferable range is 0.01 to 0.50 wt%.

rare earth metal

Rare earth metals (RE) having atomic numbers 57 (La) to 71 (Lu), including cerium (Ce) and lanthanum (La), reduce local corrosion due to precipitates deposited in the matrix. it works In addition, corrosion resistance is strengthened by reducing components such as iron (Fe) and nickel (Ni), which are corrosion-resistant elements present in the molten metal during aluminum production.

In addition, by improving the ductility and adhesion of the oxide film formed at the grain boundary or the surface, the lifespan of the oxide film is extended and corrosion resistance is improved. In addition, by increasing the strength and ductility of the aluminum alloy, the plastic workability of the metal is improved, and there is an effect of improving the brazing properties. In addition, rare earth metals increase the surface gloss by changing the alloy surface properties and increase the mold releasability.

In the present invention, the preferred range is 0.0001 to 3.0 wt%, and more preferably, the content range of cerium (Ce), lanthanum (La), other rare earths or a combination thereof is 0.05 to 1.5 wt%.

other elements

In all of the above cases, the aluminum alloy is an alloying element widely used in the aluminum industry (Cr, V, Ni, In, Pb, Bi, Ca, Na, P, B, Ag, Pd, Sb, Sc, Nb, Co, Mo, Be, Hf or Y) and unavoidable impurities may be additionally further included. In particular, in the case of phosphorus (P), when the phosphorus component in the form of gallium phosphide or indium phosphide is added in the range of 1 to 250 ppm or 1 to 30 ppm, there is a grain refining effect, and in the case of boron (B), the grain refining effect is also effected. there is

In the present invention, the alloying element zirconium (Zr) may be added in the form of a metal, but may be present in the alloy in the form of a nanoparticle-sized oxide in order to further enhance the effect of the addition. This is one of the great features of the present invention.

When the nano-sized particles of zirconium oxide are finely distributed in the aluminum alloy, by the principle of fine particle dispersion strengthening, the movement of dislocations that occur during the deformation of the alloy within the grains is prevented, so that the strength can be improved without reducing the ductility. . In addition, when zirconium (Zr) is added to the alloy as a metal component, the ductility is reduced above a certain concentration, but when it is finely dispersed and distributed in the crystal grains in the form of nanoparticle oxide, the ductility does not decrease even at a certain amount or more, unlike the metal component. There are features that do not.

Zirconium (Zr) has a melting point of 1,855°C and is difficult to dissolve in a general aluminum alloy manufacturing process. At this time, zirconium is present as a metal component in the alloy.

On the other hand, in order to make zirconium (Zr) exist in the form of a fine oxide in the alloy, _{zirconium oxide fine powder such as ZrO 2 having a} nanometer size is added to the aluminum molten metal, or ZrH, ZrH ₂ , ZrH _{4 In} the form of a zirconium hydride powder such as ZrH 4 can be poured into the aluminum molten metal. However, since it is difficult to obtain a uniform dispersion state in the method of directly inputting the _{molten metal, it is more efficient to prepare the Al-ZrO 2} master alloy and then inject the master alloy into the molten metal. When preparing the master alloy, it is preferable to divide the particles into several batches and inject them in small amounts so that they can be uniformly dispersed in the master alloy. Similarly, the addition of nano-sized particles such as SiO ₂ , Al ₂ O ₃ , Y ₂ O ₃ , CeO ₂ , La ₂ O ₃ may produce an effect similar to that of _{ZrO 2 .} At this time _{, the preferred range of the oxide (ZrO 2} , SiO ₂ , Al ₂ O ₃ , Y ₂ O ₃ , CeO ₂ , La ₂ O ₃ ) is in the range of 0.0001 to 0.50 wt%.

Molybdenum (Mo) also has a high melting point, so it is preferable to use an Al-Mo master alloy when added to the molten metal.

Meanwhile, in the present invention, if the aluminum alloy is subjected to an aging heat treatment at 100 to 200° C. for 0.5 to 24 hours after solution heat treatment after the die casting process, the properties of the alloy can be further strengthened.

(Example)

The alloy according to the present invention was manufactured by using a crucible electric furnace to control the temperature of the alloy molten metal in a temperature range of 670 to 850° C., and to manufacture an ingot through casting. This ingot was mold-cast through a die-casting device, and the process parameters at this time used a typical range used in aluminum die-casting. T6 heat treatment was performed under normal heat treatment conditions. The alloy composition and heat treatment conditions of Comparative Examples and Examples of the present invention are shown in Table 1.

division Composition (wt%) heat treatment Si Mg Mn Cu Zn Fe Ti Sr Zr/ZrO ₂ Re Al comparative example AC4A 8.00 0.50 0.50 0.10 0.10 0.10 0.05 - - - remain T6 AC8A 11.0 1.00 0.15 1.00 0.10 0.10 0.05 - - - remain T6 7075 0.40 2.50 0.30 1.50 5.50 0.10 0.05 - - - remain T6 Example One 8.00 0.50 0.30 0.10 0.10 0.10 0.05 0.01 0.15 0.3 remain T6 2 8.00 0.50 0.50 0.10 1.50 0.10 0.05 0.01 0.15 0.3 remain T6 3 8.00 0.50 0.50 0.10 5.50 0.10 0.05 0.01 0.15 0.3 remain T6 4 8.00 0.50 0.50 0.10 8.50 0.10 0.05 0.01 0.15 0.3 remain T6 5 8.00 2.50 0.50 0.10 5.50 0.10 0.05 0.01 0.15 0.3 remain T6 6 11.00 2.50 0.30 1.50 5.50 0.10 0.05 - - - remain T6

※ RE (Rare Earth Element): Rare earth elements, Ce and La, etc.

※ The above composition figures are target values, and the manufacturing error of the composition according to the actual alloy manufacturing falls within the normal error range.

Tensile strength, yield strength, elongation, fluidity, and releasability of the alloy prepared as described above were measured and shown in Table 3, among which the measurement results for mechanical properties are shown in FIG. 1 .

In order to evaluate tensile strength, yield strength and elongation, a tensile test according to KS standards was performed. A spiral mold as shown in FIGS. 2A to 2B was manufactured. FIG. 2a shows a spiral mold, and FIG. 2b shows a funnel and a cover for pouring molten metal into the spiral mold. Examples 1 to 6 and Comparative Examples 1 to 4 were gravity cast in a spiral mold under the same conditions to measure the length that flowed into the mold until solidified. was evaluated as The subsequent evaluation of the releasability was evaluated in five steps from A (best) to E (lowest) by visually checking the degree of bubble formation, the degree of pinhole formation, and the degree of wrinkling after the casting was removed from the mold after casting.

division The tensile strength
(MPa) yield strength
(MPa) elongation
(%) liquidity atypia comparative example AC4A 255 195 2.5 C - AC8A 315 205 1.2 B - A7075 530 460 5.1 - - Example One 305 210 5.7 B A 2 315 215 5.1 B A 3 320 225 5.2 B A 4 340 255 6.5 A A 5 335 260 6.2 B B 6 385 280 3.7 B C

※ Liquidity: A (top), B (middle), C (bottom),

※ Releasability: A (best), B (upper), C (middle), D (lower), E (lowest)

According to Table 2, the comparative example and the example of the present invention show that the conditions are similar except for a few other metal components, but the case of the present invention is superior. Comparing A7075 and Example 6 of Comparative Examples, it is shown that as the amount of Si increases, the fluidity increases and the mechanical strength decreases. Also, when Comparative Example AC4A and Examples 1 to 4 were compared, the addition of Zn showed an effect of increasing the tensile strength, and the addition of Zr and rare earth improved ductility and releasability. When comparing Examples 3 and 5, it can be seen that the tensile strength increases as the amount of Mg increases, but the releasability decreases slightly. The mechanical strength of a typical embodiment of the present invention is shown in FIG. 1 .

Claims (17)

Aluminum (Al) as a main component,
8.0 to 11.5 wt% of silicon (Si);
0.1 to 9.0 wt% of zinc (Zn);
0.10 to 3.0 wt % of magnesium (Mg);
0.0001 to 0.1999 wt% of copper (Cu);
0.0001 to 0.80 wt% of manganese (Mn);
1.3 wt% or less of iron (Fe);
0.30 wt% or less of titanium (Ti);
0.0001 to 0.045 wt% of strontium (Sr);
It characterized in that it comprises a, high-strength aluminum alloy for die-casting.
According to claim 1,
The aluminum alloy is an aluminum alloy for high strength die casting, characterized in that the content of silicon (Si) is 8.0 to 10.0 wt% or 9.0 to 11.0 wt% or 9.50 to 11.50 wt%.
According to claim 1,
The aluminum alloy is an aluminum alloy for high-strength die casting, characterized in that the content of zinc (Zn) is 1.0 to 9.0 wt% or 4.0 to 9.0 wt% or 5.0 to 9.0 wt%.
According to claim 1,
The aluminum alloy is an aluminum alloy for high-strength die casting, characterized in that the content of magnesium (Mg) is 0.10 to 0.60 wt% or 0.6001 to 3.0 wt.
According to claim 1,
The aluminum alloy is an aluminum alloy for high-strength die casting, characterized in that the content of copper (Cu) is 0.10 to 0.60 wt% or 0.6001 to 1.9999 wt%.
According to claim 1,
The aluminum alloy is an aluminum alloy for high-strength die casting, characterized in that the content of manganese (Mn) is 0.30 to 0.60 wt% or 0.50 to 0.80 wt%.
According to claim 1,
The aluminum alloy is an aluminum alloy for high-strength die casting, characterized in that the content of iron (Fe) is in the range of 0.55 wt% or less or 0.15 wt% or less.
According to claim 1,
The aluminum alloy is an aluminum alloy for high-strength die casting, characterized in that the content of titanium (Ti) is in the range of 0.20 wt% or less or 0.15 wt% or less.
According to claim 1,
The aluminum alloy is 0.003 to 0.030 wt% or 0.005 to 0.015 wt% of strontium (Sr), characterized in that the range of, high-strength aluminum alloy for die casting.
According to claim 1,
The aluminum alloy contains lanthanum (La) and cerium (Ce) with an atomic number of 57 (La) to 71 (Lu) rare earth metals or a combination thereof in the range of 0.0001 to 3.0 wt%. High-strength aluminum alloy for die-casting, characterized in that it further comprises.
According to claim 1,
The aluminum alloy is an aluminum alloy for high-strength die casting, characterized in that it further comprises zirconium (Zr) of 0.0001 to 0.30 wt% or 0.05 to 0.30 wt%.
According to claim 1,
The aluminum alloy further comprises any one of gallium phosphide (InP), indium phosphide (GaP) or a combination thereof in an amount corresponding to 0.0001 to 0.0250 wt% or 0.0001 to 0.0030 wt% of the phosphorus (P) component Characterized by, high-strength aluminum alloy for die-casting.
According to claim 1,
The aluminum alloy is an aluminum alloy for high-strength die casting, characterized in that it further comprises molybdenum (Mo) of 0.0001 to 0.50 wt% or 0.01 to 0.50 wt%.
According to claim 1,
The aluminum alloy further includes at least one selected from Cr, V, Ni, In, Pb, Bi, Ca, Na, P, B, Ag, Pd, Sb, Sc, Nb, Co, Mo, Be, Hf, or Y. Characterized in that it comprises, an aluminum alloy for high-strength die-casting.
According to claim 1,
_{The aluminum alloy further includes any one of ZrO 2} , SiO ₂ , Al ₂ O ₃ , Y ₂ O _{3 ,} CeO ₂ , La ₂ O ₃ or a combination thereof in the range of 0.0001 to 0.50 wt%, and these oxides are An aluminum alloy for high-strength die casting, characterized in that it is uniformly dispersed in the state of nano-sized particles in the alloy.
16. The method of claim 15,
ZrO ₂ , SiO ₂ , Al ₂ O ₃ , Y ₂ O ₃ , CeO ₂ , La ₂ O _{3 ,} or any one of a combination thereof produces a master alloy of aluminum and its oxides, and the master alloy is added to the molten metal. Aluminum alloy for high-strength die-casting, characterized in that the input.
Aluminum (Al) as a main component,
8.0 to 11.5 wt% of silicon (Si);
0.1 to 9.0 wt% of zinc (Zn);
0.10 to 3.0 wt % of magnesium (Mg);
0.0001 to 0.1999 wt% of copper (Cu);
0.0001 to 0.80 wt% of manganese (Mn);
1.3 wt% or less of iron (Fe);
0.30 wt% or less of titanium (Ti);
With respect to the aluminum alloy containing 0.0001 ~ 0.045wt% of strontium (Sr),
A method of manufacturing an aluminum alloy for high-strength die-casting, characterized in that heat treatment is performed at 100 to 200° C. for 0.5 to 24 hours.

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